谁能帮我解决数学难题啊

问题描述:

谁能帮我解决数学难题啊
因式分解
1.1/3X^2-4/3X-7 2.-a+11/2ab-6b^2
3.(x+y)^2-4(x+y)-12 4.(2x-y)^2-4x+2y
5.-6m^2+7mn-5/3n^2 6.(x^2+5x-2)(x^2+5x)-8

1/3X^2-4/3X-7 =1/3(x-7)(x+3)
-a+11/2ab-6b^2 =-1/2(2a-3b)(a-4b)
(x+y)^2-4(x+y)-12 =(x+y-6)(x+y+2)
(2x-y)^2-4x+2y =(2x-y)(2x-y-2)
-6m^2+7mn-5/3n^2 =-1/3(3m-n)(6m-5)
(x^2+5x-2)(x^2+5x)-8 =(x^2+5x-4)(x^2+5x+2)